![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
How can Archimedes' principle be understood
One of the basic principles of mechanics. An object immersed in a liquid is subjected to upward buoyancy equal to the gravity of the liquid displaced by the object
How to understand the immersion of Archimedes principle
That is to say, the volume of the object = the volume of the discharged water
In the following understanding of Archimedes principle, the correct one is ()
A. The buoyancy of an object in a liquid is equal to the product of the volume of the object and the density of the liquid
B. An object immersed in a liquid is subject to upward buoyancy equal to the gravity of the liquid
C. An object immersed in a liquid is subjected to upward buoyancy equal to the gravity of the object
D. An object immersed in a liquid is subjected to upward buoyancy equal to the gravity of the object in the liquid
B.
F = row G
RELATED INFORMATIONS
- 1. What does Archimedes' principle show
- 2. Physics problems. Archimedes principle 1. The bottom area of the thin-walled cylindrical container placed on the horizontal table is 100 square centimeters. The hook of the spring dynamometer is hung with an object block of 10N. Now immerse the object block in the water, and the water surface in the container rises from 16cm to 20cm. Calculate the volume of the liquid discharged by the object block, the buoyancy of the object block, and the indication of the spring dynamometer 2. The gravity of a metal block in the air is 39n. When it is completely immersed in water, the indication of the spring dynamometer (the metal block does not contact the bottom) is 34n. Calculate the buoyancy of the metal block by water and the volume of the metal block
- 3. A hydrogen balloon, with a net weight of 30n, is filled with 20m and 179; the density of hydrogen is 0.09kg/m and that of air is 1.29kg/m;, G=10N/kg (1) How many objects can fall from the bottom of a hydrogen balloon
- 4. But according to Archimedes' principle, f floating = PGV row, Does the water surface rise? If there is no buoyancy, there is no v-row,
- 5. Ask junior three to review physics buoyancy exercises! Buoyancy! Exercises!
- 6. How is Kirchhoff's law of current and voltage derived?
- 7. Kirchhoff's current law and Kirchhoff's voltage law are introduced
- 8. How to understand Kirchhoff's current law? For any node or closed surface in any lumped parameter circuit, at any time, the algebraic sum of all branch currents passing through the node or closed surface is equal to zero
- 9. What is the content of Kirchhoff's law and how to understand it
- 10. 3、 Briefly introduce the contents of Kirchhoff's law of current and voltage and write the formula. 2. Three element method of first order circuit and write the formula? 3. Three elements and formula of sinusoidal alternating current?
- 11. The formula of Ohm's law in Physics
- 12. What's the difference of Ohm's law formula in AC circuit?
- 13. Try to draw a circuit diagram that conforms to the following Ohm's law expression 1、I=U+E/R 2、I=U-E/R 3、I=-U-E/R 4、I=-U+E/R
- 14. In the experiment of using free falling motion to verify the law of conservation of mechanical energy: if the instantaneous velocity is calculated and verified by measuring the distance between two points on the paper tape, the distance between point 2 and point 4 is S1, the distance between point 0 and point 3 is S2, and the period of tapping is t The relation of T = 0___ ．
- 15. Law of conservation of mechanical energy The trolley with mass m and length L stops on a smooth horizontal plane, and the small block with mass m is placed on the leftmost end of the trolley. Now, a right water balance force F is applied on the small block to make the block move uniformly and linearly from the static state. The friction force between the block and the trolley is f '. When the block slides to the rightmost end of the trolley, the distance of the trolley is s. in this process, when the block slides to the rightmost end of the trolley, the distance between the block and the trolley is s, Is the added mechanical energy of block and trolley FS? Why?
- 16. On the conservation law of physical mechanical energy The radius of the smooth track fixed in the vertical plane is r, and a small ball with mass m moves in a circle on the track in an anti clockwise direction. If the pressure of the ball on the track is 8 mg at the lowest point a, the pressure on the track is 8 mg when the ball moves to the highest point B______ The answer is 2mg, but I don't know why
- 17. Considering the air resistance, is the falling time of different objects at the same height related to the density? As the title!
- 18. How to design experiments in physics to prove that air resistance affects the falling of objects?
- 19. What are the conditions of the law of conservation of momentum, the law of conservation of kinetic energy and the law of conservation of mechanical energy, What's the difference?
- 20. As for the applicable conditions of the law of conservation of mechanical energy, the correct one in the following statement is () A. When there are other external forces, as long as the combined external force is zero, the mechanical energy is conserved. C. when there are other external forces, as long as the work of the resultant force of other forces is zero, the mechanical energy is conserved. D. when the projectile flies in the air without resistance, it is only affected by the heavy force, so the mechanical energy before and after the explosion is conserved